[project.project] implemented method check_remaining_tasks_and_validate(); [project.task] override unlink() to add a call to check_remaining_tasks_and_validate()
[project.task] refactoring reportHours(): use now check_remaining_tasks_and_validate() and removed unused code
[mail.template ask closed] fixed template when rendering ask containing inter with cancelled task(s) #2970
[openstc.equipment.lines] added task_id (was previsouly on openbase, causing crashes because project.task were not available on openbase)
Merge branch 'production'